Focal length is the distance between the center of the mirror to the principal foci. In order to determine the focal length of a spherical mirror we should know the radius of curvature of that mirror. The distance from the vertex to the center of curvature is called radius of curvature.
The focal length is half the radius of curvature.
F = ( R / 2 ) for concave mirror F = - ( R / 2 ) for convex mirror
For a convex mirror Input : R = 30 Output : F = 15 For a convex mirror Input : R = 25 Output : F = - 12.5
Focal length ofspherical concavemirror is : 15.0 units Focal length ofspherical convexmirror is : -15.0 units
Please refer complete article on Program to determine focal length of a spherical mirror for more details!
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